7の段(7の倍数)

7 × 1 = 7
7 × 2 = 14
7 × 3 = 21
7 × 4 = 28
7 × 5 = 35
7 × 6 = 42
7 × 7 = 49
7 × 8 = 56
7 × 9 = 63
7 × 10 = 70
7 × 11 = 77
7 × 12 = 84
7 × 13 = 91
7 × 14 = 98
7 × 15 = 105
7 × 16 = 112
7 × 17 = 119
7 × 18 = 126
7 × 19 = 133
7 × 20 = 140
7 × 21 = 147
7 × 22 = 154
7 × 23 = 161
7 × 24 = 168
7 × 25 = 175
7 × 26 = 182
7 × 27 = 189
7 × 28 = 196
7 × 29 = 203
7 × 30 = 210

問題

7 × 28 = ( )

7 × 13 = ( )

7 × 15 = ( )

7 × 22 = ( )

7 × 19 = ( )

解答

7 × 28 = 196

7 × 13 = 91

7 × 15 = 105

7 × 22 = 154

7 × 19 = 133

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